The Taliban militants opposing the government forces have fought steadily through 2016, including over the winter, officials said. The fledgling democracy has also been tormented by rival terror group ISIS.

This grim uptick in security deaths comes as a United Nations report released Monday found that over 1,600 Afghan civilians were killed in the first half of 2016, nearly 400 of them children. The number of those casualties is the highest since records were kept in 2009.

Faced with a Taliban resurgence, President Barack Obama announced earlier this month that he would slow the withdrawal of U.S. troops in Afghanistan, leaving about 8,400 service members there when he leaves office in January.

Initially, Obama planned to drop American troop levels from 9,800 to 5,500 by the end of 2016.

Nicholson, meanwhile, also acknowledged that five U.S. Special Operations troops were wounded in the eastern province of Nangarhar in the past few days. The Americans were partnered with Afghan Special Operations forces in southern Nangarhar during a counterterrorism mission.

Nicholson said the Americans were wounded by small arms fire and shrapnel during a clearing operation. Two of the wounded returned to duty, while three others were airlifted out of the country.

ISIS has built a presence in Nangarhar recently. The Afghan military, with the aid of U.S. troops, were reportedly planning to strike at their positions.